Lower-hybrid instabilities driven by an ion velocity ring

Details Lower-hybrid instabilities driven by an ion velocity ring Lower-hybrid instabilities driven by an ion velocity ring

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jplph..34..445a&link_type=abstract

Journal of Plasma Physics (ISSN 0022-3778), vol. 34, Dec. 1985, p. 445-465.

Physics

Plasma Physics

19

Beta Factor, Ion Distribution, Magnetohydrodynamic Stability, Electromagnetism, Temperature Effects, Wave Dispersion, Wave Propagation

Scientific paper

The lower-hybrid instabilities in high-beta (ratio of plasma to magnetic pressure) plasmas driven by ring-ion distributions in velocity space are investigated. A dispersion equation including electromagnetic effects is derived. In the low-beta limit, analytic expressions are obtained which illuminate the physical nature of the instabilities. The complete dispersion equation is solved numerically as a function of ring speed and plasma beta for several types of ring distribution. Electromagnetic effects are important for relatively energetic rings even in the low-beta regime, suppressing growth rates and shifting the angle of propagation to more oblique angles. Stabilization by thermal effects is also discussed. Application of these results to the earth's bow shock, AMPTE, comets and solar flares is suggested.

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